strenuous

Busy is a synonym of strenuous.

As adjectives the difference between busy and strenuous

is that busy is crowded with business or activities; having a great deal going on while strenuous is urgent, ardent, zealous.

As a verb busy

is to make somebody busy , to keep busy with, to occupy, to make occupied.

As a noun busy

is a police officer.

As an adjective strenuous

is urgent, ardent, zealous.

As a verb fatiguing is

present participle of fatigue.

Thorough is a related term of strenuous.

As adjectives the difference between thorough and strenuous

is that thorough is painstaking and careful not to miss or omit any detail while strenuous is urgent, ardent, zealous.

As a preposition thorough

is (obsolete) through.

As a noun thorough

is (uk|dialect) a furrow between two ridges, to drain off the surface water.

Thoroughgoing is a related term of strenuous.

As adjectives the difference between thoroughgoing and strenuous

is that thoroughgoing is complete; thorough; full; with great attention to detail while strenuous is urgent, ardent, zealous.

As an adjective strenuous is

urgent, ardent, zealous.

Strenuous is a related term of wearying.

As an adjective strenuous

is urgent, ardent, zealous.

As a verb wearying is

.

Strenuous is a related term of impenetrable.

As adjectives the difference between strenuous and impenetrable

is that strenuous is urgent, ardent, zealous while impenetrable is impenetrable.

Herculean is a synonym of strenuous.

As adjectives the difference between herculean and strenuous

is that herculean is (herculean) while strenuous is urgent, ardent, zealous.

As adjectives the difference between strenuous and complex

is that strenuous is urgent, ardent, zealous while complex is made up of multiple parts; composite; not simple.

As a noun complex is

a problem.

As a verb complex is

to form a complex with another substance.

Strenuous is a related term of knotty.

As adjectives the difference between strenuous and knotty

is that strenuous is urgent, ardent, zealous while knotty is full of knots.